PLATE 42. 
Fig. 1, 3. 252. 3. CyYRTOCERAS MACROSTOMUM. (Pag. 194.) 
1 a. A fragment, showing a partial section. 
1%. A large fragment, showing the wide outer chamber. 
1c. Section of the smaller extremity of the last. 
3 a. Dorsal view of a fragment probably identical : the strie in the figure do not bend so abruptly as in the 
original, 3b. Lateral view of the same. 
Fig. 2, 3. 253. 4. CyRTocERAS CONSTRICTOSTRIATUM. (Pag. 195.) 
2a. A fragment, showing several of the septa and a part of the outer chamber. 
26. Transverse section, somewhat compressed, showing the position of the siphuncle. 
3 e. A fragment, showing the surface markings. 
3 d. Section of the same, which does not show the siphuncle. 
Fig. 4. 254. 5. CyrTocERAS MULTICAMERATUM. (Pag. 195.) 
Fig. 5. 255. 6. CyRTOCERAS ARCUATUM. (Pag. 196.) 
. Lateral view of the specimen, which is crushed towards the lower extremity. 
. Section of the same. 
. The base of a parasitic coral, or of a crinoid, attached to the fossil. 
n 
On 
oS StS 
Fig. 6. 256. 7. CyRTocERAS CAMURUM. (Pag. 196.) 
Fig. 7. 258. 11. ORTHOCERAS ARCUOLIRATUM. (Pag. 198.) 
7a. A fragment near the apex of the shell. 
7b. A fragment of larger diameter, showing the convexity of a septum. 
7c. Transverse section, showing the central position of the siphuncle. 
a 
Fig. 8. 259. 12. ORTHOCERAS TERETIFORME. (Pag. 198.) 
8 a. Fragments of two specimens connected by the dotted lines. The annulations are represented too broad. 
8 b. Section showing the position of the siphuncle. 
